Description General description These traps greatly reduce carry-over from foaming or bumping. Because the venting hole is located at the top, the foam can be prevented from climbing higher into the condenser. Application: for use with solvents that foam excessively during rotary evaporation. Inner vapor tube is sealed to the top of trap to prevent foam entry into condenser. Legal Information Aldrich is a registered trademark of Sigma-Aldrich Co. LLC